The M48 bridge over the River Severn will be closed for maintenance this weekend due to roadworks between Junction 1 A403 (Aust) and Junction 2 A466 Wye Valley Link Road (Chepstow).
The closure will be in place from 4am on Saturday 12 August until 10pm on Sunday 13 August.
There are currently no trains running between Bristol Temple Meads and Severn Beach due to a train striking a wheel barrow.
Tickets being accepted on local bus routes.
One lane is closed and traffic is slow due to a broken down vehicle on the Eastbound M4 between J22 for the M49 and J21 for the M48.
Police are on the scene and recovery is underway.
There are very strong winds on the M48 Severn Bridge this morning.
A speed restriction is in place of 40mph.
The M48 Severn Bridge is closed due to an overturned lorry.
Both lanes on the bridge are shut due. The M4 crossing is currently open.
Police say the Second Severn Crossing has reopened westbound following a blockade by Kurdish protesters.
The protest caused the Severn Bridge to shut after demonstrators stopped their cars in the middle of the motorway.
Around 15 people stopped traffic and held up a Kurdish flag half way across the motorway bridge between England and Wales.
Eyewitnesses say the group were yelling anti-Turkish slogans. The demonstration started at 1.30pm and lasted for an hour.
Watch this eye-witness video taken from a vehicle passing the protest.
A police spokeswoman has said motorists were not impressed by the demonstration holding up traffic.
Police have yet to confirm if there have been any arrests and the roads are now clear.
There are long delays on the M4 westbound near Bristol. It was caused by a lorry that overturned between J21 for the M48 and J22 for the M49 at 6.30am this morning. There is congestion right back to J18 for Bath.
Police say removing the overturned lorry has proved to be a "significant challenge". The operation is ongoing.
Meanwhile the Highways Agency is advising motorists to divert via the M48 towards Wales using the original Severn Bridge, although this is also very congested as a result of the extra traffic from the closure.
The M4 is closed westbound between Junction 21 (M48) and Junction 22 (M49). It is due to accident investigation and recovery work after a lorry overturned at 6.30am.
It is causing major congestion back to the M32.
Drivers are being advised to divert via the M48 towards Wales using the old Severn Bridge but be warned the closure is having a knock on effect and there are heavy queues at the Toll Booths.
UKIP say tolls should be scrapped once the Severn bridges return into public ownership.
The Government says VAT will be scrapped on charges in 2018, but on a visit to the Welsh side of the bridge today, UKIP's leader Nigel Farage called for the fee to be completely abolished.